Patents and Other Intangible Assets - Schedule of Patents and Other Intangibles Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 49,430	$ 46,278
Accumulated amortization	(38,969)	(38,817)
Patents and other intangible assets, net	10,461	7,461
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	38,621	38,348
Accumulated amortization	(34,151)	(34,717)
Trademarks-finite lived [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	533	319
Accumulated amortization	(193)	(138)
Licenses and other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	10,276	7,611
Accumulated amortization	$ (4,625)	$ (3,962)

Finite and indefinite lived intangible assets.

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph ((a)(1),(b))
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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